Narrow Band Polling Protocol Parameter Settings

Details

Topic or Information

Recommended settings for protocol timing configuration on PXA270 Family and Omnii Family Narrow Band devices 

Applies To

- PXA270 Family and Omnii Family Narrow Band devices 
- 9160 base station

Details

Terminology

Each generation of terminals will be identified by the hand held terminal model number. The protocol timing is consistent within each generation. The "7030" generation represents the 7030, 8055 and 8060 terminals. The "7035" generation represents the 7035, 8255, and 8260 terminals. The "7530" generation represents the 7530, 8525 and 8530 terminals.

Systems that consist of RA1001 and TRX7370 radios will be identified as "RA1001/TRX7370 modern" systems. Systems that consist of RA1001/TRX7370 and the older TRX73xx will be identified as "TRX73xx/RA1001/TRX7370 legacy" systems.

TRX7370/RA1001 Preamble Configuration

The configurations shown in the following tables are broken into two categories:

• TRX73xx/RA1001/TRX7370 legacy systems and
• RA1001/TRX7370 modern systems.

For legacy systems, the RA1001/TRX7370 transmission preamble must be configured to be backwards compatible with the older TRX73xx radios.

While a RA1001/TRX7370 system will function properly using a TRX73xx preamble, it is possible to improve performance by using a preamble optimized for the RA1001/TRX7370. As a rule of thumb for configuration, if it is unclear whether or not a RA1001/TRX7370 product will be used with older TRX73xx radios always configure the RA1001/TRX7370 to use a TRX73xx preamble.

For 2-level modulation, the preamble consists of the transmission of a number of DEL characters.

For the 7035 generation of terminals, the number of DELs for 2-level modulation is configured using the RTEST 'dt' command. For the 7530 generation of terminals, the number of DELs for 2-level modulation is configured in the Narrow Band control panel. Press the "Advanced" button in the "Radio" tab the to access this configuration.

For 4-level modulation, the preamble consists of the transmission of a period of unmodulated carrier followed by a number of DEL characters. For the 7035 generation of terminals, the unmodulated carrier duration and number of DELs are configured using the RTEST 'txd' and 'df' commands respectively. For the 7530 generation of terminals, the number of DELs for 4-level modulation is configured in the Narrow Band control panel. Press the "Advanced" button in the "Radio" tab the to access this configuration.

The following table shows the recommended preamble settings for both 2- and 4-level modulations.

TRX73xx, RA1001, TRX7370 Legacy Systems

Important: These configurations are for TRX73xx/RA1001/TRX7370 systems. For these systems, the TRX7370s and RA1001s must be configured to use a transmit preamble that is backwards compatible with older TRX73xx radios. Click [here] for more detail.

Configuration 1 - 9140, 9150 Base Station, 7030, 7035, 7530

4-Level 19200 Baud

4-Level 9600 Baud

2-Level 9600 Baud

2-Level 4800 Baud

Configuration 2 - 9130 RRM, 7030, 7035, 7530

4-Level 19200 Baud

4-Level 9600 Baud

2-Level 9600 Baud

2-Level 4800 Baud

Note: In the 7530 generation, the above settings are the default values in the Narrow Band Control Panel.

Configuration 3 - Network Timeplexed 9150, 7030, 7035, 7530

4-Level 19200 Baud

4-Level 9600 Baud

2-Level 9600 Baud

2-Level 4800 Baud

RA1001, TRX7370 Modern Systems

Important: These configurations are for RA1001/TRX7370 systems. For these systems, the TRX7370s and RA1001s must be configured to use a transmit preamble optimized for a RA1001/TRX7370 system. Click here for more detail.

Configuration 1 - 9150 Base Station, 7035, 7530

4-Level 19200 Baud

4-Level 9600 Baud

2-Level 9600 Baud

2-Level 4800 Baud

Configuration 2 - Network Timeplexed 9150, 7035, 7530

4-Level 19200 Baud

4-Level 9600 Baud

2-Level 9600 Baud

2-Level 4800 Baud

Notes

1. The RA1001/TRX7370 radios provide a collision detection function. A TRX7370 or RA1001 will signal a collision if carrier is asserted for a specified period of time without a SOH character being decoded. This period of time is called the collision timeout and may be configured with the RTEST 'cl' command. The "collision timeout" values in the above tables for the 9150 are the recommended settings for this value. It should be noted that the 9150 has a "Collision Size" parameter in its list of Polling Protocol parameters. Since the functionality controlled by this parameter is superseded by the RA1001/TRX7370 collision timeout, it does not require setting and should be left at its default value.
2. The Poll Timeout listed for Timeplexed systems is for configurations with one RRM (serial or network) in a group. If more than one RRM exists in a group the Poll Timeout value should be multiplied by total number of RRMs in the group.
3. The Window Delay for a 4800 baud RA1001\TRX7370 system is larger than necessary in order to comply with a configuration restriction of the 9150. For this configuration the terminal should operate fine with a setting of 10-12. However, the minimum setting of RTXON in the 9150 is 3 which prohibits the use of the more optimized settings.